Sulfonylurea compounds have the formula ##STR1## in which R is selected from the group consisting of 1-4 carbon alkyl, phenyl, and methyl substituted phenyl; R.sub.1 is selected from the group consisting of hydrogen and 1-4 carbon alkyl; and R.sub.2 is selected from the group consisting of mono- and polyhalosubstituted phenyl, 3-6 carbon alkynyl, and 2-6 carbon alkoxyalkyl.